Re: [Xen-devel] [PATCH LIVEPATCH-BUILD-TOOLS] Fix patch creation with GCC 6.1+

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Nov 25, 2016 at 04:59:17PM +0000, M A Young wrote:
> On Thu, 24 Nov 2016, Ross Lagerwall wrote:
> 
> > GCC 6.1+ fixed https://gcc.gnu.org/bugzilla/show_bug.cgi?id=192 which
> > means that .rodata.str* sections are now split by function.  We could
> > probably be smarter about including just the sections we need, but for
> > now, include all .rodata.str* sections as is done for previous versions
> > of GCC.
> > 
> > This manifests itself as symbol error. E.g.:
> > (XEN)  Unknown symbol: .LC0
> 
> There may be a problem with this patch. I built livepatch-build-tools 
> (from the xenbits git repo) with this and the other patch posted yesterday 
> and successfully built and applied xsa191 to xsa193 (cumulatively) to 
> xen-4.8.0-rc6, but the computer freezes if I try to apply xsa194 
> (cumulatively or on its own). This was the only patch I tried which got 
> the Unknown symbol: .LC3 message ie.
> (XEN) livepatch_elf.c:295: livepatch: xsa194: Unknown symbol: .LC3
> so this may be related to the crash.

Anything on the serial console? Can you use the crash functionality?
Pls make sure to boot with 'loglvl=all'. Also you may want to
build it with 'debug=y' so the livepatch debug errors show up too.

Thanks!
> 
>         Michael Young

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